This study of the Cu–Sm phase diagram has established that there are two congruent phases, CU6Sm and CU2Sm and three peritectic phases, CU5Sm, CU4Sm and CuSm. Eutectic reactions occur at 9 at.-% Sm:882° C, 28 at.-% Sm: 818° C, and 71 at.% Sm:597° C.
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